Understanding Different Types of Chemical Peels

Understanding Different Types of Chemical Peels

Chemical peels remain one of the most versatile and well-evidenced treatments in aesthetic dermatology. By applying controlled chemical solutions to the skin surface, practitioners can address an extraordinary range of concerns — from fine lines and pigmentation to acne and textural irregularities. Understanding the different types of peels, their mechanisms, and appropriate applications is essential for patients considering this effective treatment modality.

How Chemical Peels Work

Chemical peels induce controlled damage to specific layers of the skin, triggering a wound healing response that produces new, healthier tissue. According to research in the Journal of Clinical and Aesthetic Dermatology, the depth of peel determines which skin layers are affected, the degree of improvement achievable, the associated downtime and risk profile, and the conditions most effectively treated.

Superficial Peels

Superficial peels penetrate only the epidermis, removing dead skin cells and stimulating mild cellular turnover. They require minimal downtime and are suitable for most skin types.

Glycolic Acid (20-50%)

The most widely studied alpha hydroxy acid (AHA), glycolic acid has the smallest molecular size, enabling effective penetration. It improves skin texture, mild hyperpigmentation, and fine lines. Multiple peer-reviewed studies confirm its safety and efficacy across diverse skin types when used at appropriate concentrations.

Salicylic Acid (20-30%)

A beta hydroxy acid (BHA) with lipophilic properties, salicylic acid penetrates into oil-filled pores, making it the peel of choice for acne-prone and oily skin. It has anti-inflammatory and comedolytic properties, reducing both active breakouts and pore congestion.

Mandelic Acid (30-40%)

This larger-molecule AHA penetrates more slowly and evenly than glycolic acid, reducing irritation risk. It is particularly suited to darker skin types (Fitzpatrick IV-VI) where aggressive peels carry higher hyperpigmentation risk. Evidence in Dermatologic Surgery supports mandelic acid for both acne and pigmentation in melanin-rich skin.

Lactic Acid (30-50%)

A gentle AHA that also acts as a humectant, drawing moisture into the skin. Ideal for dry, sensitive skin and patients new to chemical peels. It provides mild exfoliation with minimal irritation.

Medium-Depth Peels

Medium-depth peels penetrate through the epidermis into the papillary (upper) dermis, producing more significant improvement with correspondingly greater downtime.

Trichloroacetic Acid (TCA) 15-35%

TCA is the most versatile medium-depth peeling agent. It causes protein coagulation in the epidermis and superficial dermis, triggering robust collagen remodelling. TCA peels are effective for moderate wrinkles, acne scarring, solar lentigines, and overall skin rejuvenation. The TCA CROSS technique (applying 70-100% TCA directly into individual ice pick scars) is a specialised application with excellent evidence.

Jessner’s Solution + TCA

Combining Jessner’s solution (a mixture of salicylic acid, lactic acid, and resorcinol) with TCA achieves a more uniform medium-depth peel. The Jessner’s pre-treatment breaks down the epidermal barrier, allowing more even TCA penetration and consistent depth control.

Deep Peels

Phenol (Baker-Gordon)

The deepest chemical peel available, phenol penetrates to the reticular (deep) dermis, producing dramatic improvement in severe photodamage, deep wrinkles, and scarring. However, it carries significant risks including cardiac arrhythmia (phenol is cardiotoxic and requires cardiac monitoring), permanent hypopigmentation, prolonged recovery (2-3 weeks), scarring risk, and limited use to Fitzpatrick skin types I-II.

Due to these risks, phenol peels are rarely performed in modern aesthetic practice, having been largely replaced by fractional laser technology that offers comparable results with a better safety profile.

Newer Peel Formulations

Modified Jessner’s Peels

Modern modifications use citric acid, kojic acid, or arbutin instead of resorcinol, providing anti-pigment properties alongside exfoliation with improved tolerability.

Pyruvic Acid

An alpha-keto acid with properties intermediate between AHAs and TCA. It has keratolytic, antimicrobial, and sebostatic properties, making it useful for acne-prone skin requiring moderate-depth treatment.

Combination/Cocktail Peels

Modern formulations often combine multiple acids at carefully calibrated concentrations to address multiple concerns simultaneously while minimising the risk associated with any single agent at high concentration.

Choosing the Right Peel

The selection of chemical peel depends on the specific skin concern, skin type and ethnicity, tolerance for downtime, previous peel experience, concurrent skincare regime, and any contraindications. At Axiom Aesthetics, our practitioners conduct thorough skin analysis and history-taking before recommending a specific peel protocol.

Preparation and Aftercare

Pre-Peel Preparation

Optimal peel outcomes require 2-4 weeks of skin preparation including daily SPF 50, retinoid priming to normalise cell turnover, hydroquinone or arbutin for patients with pigmentation risk, and discontinuation of certain medications and supplements.

Post-Peel Care

Aftercare is critical for results and safety. Key principles include gentle cleansing only, ceramide-rich moisturisers for barrier support, strict sun avoidance and SPF 50, no active ingredients until the skin has fully healed, and no picking or peeling of flaking skin.

Frequently Asked Questions

How often can I have a chemical peel?

Superficial peels can be performed every 2-4 weeks as part of a course. Medium-depth peels are typically spaced 6-8 weeks apart. Deep peels are generally a one-time treatment. Your practitioner will recommend an appropriate schedule.

Are chemical peels safe for dark skin?

Yes, with appropriate peel selection and skin preparation. Mandelic acid, salicylic acid, and low-concentration glycolic acid are well-suited to darker skin types. Medium and deep peels carry higher PIH risk and require careful management.

Will a chemical peel make my skin sensitive to the sun?

Yes, freshly peeled skin is more photosensitive. Strict sun protection for at least 2-4 weeks post-peel is essential. This is one reason peels are often scheduled during autumn and winter months.

Can chemical peels treat acne?

Yes, particularly salicylic acid and mandelic acid peels. They reduce active breakouts, improve post-acne marks, and help manage oily, congested skin. A course of 4-6 peels is typically recommended for acne management.

This article is for informational purposes only and does not constitute medical advice. Chemical peels should only be performed by qualified, trained practitioners. All peels at Axiom Aesthetics are preceded by thorough skin assessment and preparation protocols.